Heat-exchanging apparatus.



H. ZIMMERMANN.

HEAT EXCHANGING APPARATUS.

APPLICATION FILED SEPT. 2l. |916. Lg. Patented Dec. 31,1918

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HEAT EXCHANGING APPARATUS.

APPLICATION FILED SEPT. 2I. Isle.

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Patented Dee. 31, 1918.

H. ZIMMERMANN.

HEAT EXCHANGING APPARATUS.

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Snom/Lto@ changing apparatus tiran .spaans .artnr autres.

HANS ZIMMERMANN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO SCHUTTE &KOERTING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

Specification of Letters Patent.

Patented Dec. 31, 1918.

Application led September 21, 1916. Serial No. 121,343.

To all whom t may concern:

Be it known that ll, HANS ZIMMERMANN, a subject of the German Empire,residing in the city and county of Philadelphia, in the State ofPennsylvania, have invented certain new and useful Improvements in Heat-Fxchanging Apparatus, of which the .tollowing is a true and exactdescription, reference being had to the accompanying drawings, whichform a part thereof.

My present invention relates .to heat interof the type in which a heattransfer is effected between a Huid in contact with the inner walls, andanother fluid in contact withthe outerl walls ot a group of tubes.

The general object of my invention is to provide improved baille meansfor causing the iuid in contact with the outer walls of' the-tubes toHow in multiple passes, i. e., in a zig-zag course through the intertubespace. More specifically the object of my invention is to provide simpleand effective baille means especially adapted for use in and as a partof apparatus of the general type referred to, and in which the tubes arepermanently connected to the tube sheets and with the latter and thebaille means form a unit bodily insertible in and remov-` able from thecasing which forms the outer wall of the intertube space, and in whichthe bailles make relatively tight joints with the tube sheets and theinclosing casing to prevent leakage or short circuits of the fluid aboutthe baHes when the apparatus is operated under such conditions that thellow resistance creates a relatively large difierence between thepressures of the fluid circulating through the intertube space at ,theinlet to, and outlet from said space.

rllhe invention is of especial utility in the case of apparatus in whichthe tubes are relatively small andare relatively closely spacedtogether, and a very rapid circulation through the intertube space ishad, to thereby obtain a relatively large heat transfer capacity perlunit of bulk, as is desirable in condensers and coolers employed insubmarines, air-craft and other installations where economy in bulk andweight of such apparatus is highly desirable. y. Y rll`heA variousfeatures ofv novelty which characterize my invention are pointed outwith particularity in the claims annexed to and forming va part of thisspecilication.

For a better understanding of the invention, however, and the advantagespossessed by it, reference should be had to the accompanying drawingsand descriptive matter in which l have illustrated and describedpreerred embodiments of my invention.

0f the drawings:

Figure 1 is a longitudinal section of a preferred form of apparatusembodying my invention;

Fig. 2 is a section taken on the line 2-*2 of Fig. .1;

Fig. 3 is a perspective view of a detail of construction employed; y

Fig. 4: is an enlarged partial section on the line 4 4: of Fig. 2;

Fig. 5 is an enlarged partial section on the line 5--5 of Figs. 2 and 4;

Fig. 6 is an enlarged partial section on the line 6*-6 of Fig. 2;

Fig. 7 is a transverse section through a modified form of apparatus, thesection being taken on the line 7-7 of Fig. 8; and

Fig. 8 is a plan view of, the apparatus shown in section in Fig. 7.

ln the drawings and referring first to the construction shown in Figs. 1to 6, A represents the casing body of a heat exchanging deviceconstructed in accordance with the present invention and particularlydevised for use in cooling theV lubricating oil of engines forsubmarines, though useful in other relations where a relatively largeheat exchange for a given bulk of apparatus is desirable. Secured'to theends of the casing body A are chambered end members B and C. Thechambers inthe two end members are connected by the tubes D which areconnected at their ends into tube sheets. "ll-he tube shget adjacent thecasing end member B comprises an outer ring E of cast iron, brass.. orother suitable metal, and a body of metal F ordinarily having a lowermelting point than the -metali of the ring E and permanently connectingthe adjacent ends of the tubes D to the ring E by being cast in place.rlhe 'tube sheet towhicn the opposits ends ,of the tubes are connectedis of essentially the same construction as thc .one first describedexcept that the member e replacing the ring E is formed with anoutwardly extending rib or lange e2 which is clamped between the casingbody A and end member C while the cylindrical outer sur- 'face of thering E has a sliding .tit with the inner wall of the casing body A. F2represent packing rings. triangular in cross section, surrounding thering E and clamped, one between a spacing ring G and the casing memberA, and the other between the ringI G and end member B.

The chambered end member B, in the particular construction shown, isprovided with a lower inlet chamber B', an upper outlet chamber B3 andan intermediate chamber B2, .while the end member C is formed withl Thebailling arrangement of the intertube i space in the particular form ofthe invention illustrated in Figs. l to 6 comprises upper and lowerbaille plates H and a central batfle plate. H2 which are secured to abaille support I, and intermediate baille plates H lying l'between thecentral baille plate H2 and the two baille plates H which are connectedto the baille plate support IA. The baille plate 'support I is in theform of a segment of a cylinder shaped to iit snugly against the innerwall of the casing body A at one side of the latter between the levelsof the two baille plates H. Atits upper and lower edges the member I isprovided with a longitudinally extending inwardly projecting flange Iparallel to the baille plates I and to which the latter are secured asby means of the bolts J. Midway between its edges the baille platesupport I is formed with a longitudinally extending inwardly projectingrib formed with a channel snugly receiving the adjacent edge of thebaille plate H2. The latter is secured in place by means of screws Kwhich are received in unthreadedsockets formed in the support H andextending from the outer wall of the latter into intersection with thechannel I3. These screws enter threaded openingsformed for the purposein the adjacent edge of the baille plate H2. Where it is desirable tohave the diameter of the screws K greater than the thickness of thebaille plate, as is the case.

with the construction illustrated, the partial encircling of the screwsby .thethreads of the openings in the plate givesample strength to holdthe baille plate in place.

The baille plate H2 is formed adjacent the rib I2, with slots H3 toreceive the spring bars L which extend transversely to the bale platesand bear at their ends against the adjacent edges of thel baille platesIl.

As shown, there are two of these springs L arranged in line with acorresponding' pair of screws K, and the latter have reduced extensionsK which pass through apertures formed for the purpose in the springs Land thus fix the latterin place in assembling the apparatus.

The baille plate support IA is analogous in construction to the memberI, but is a somewhat smaller segment of a cylinder, and bears againstthe opposite side of the inner wall of the casing member' A. The memberIA is formed with longitudinally eX- tending internally grooved ribs I4at its upper and lower edges in which the adjacent edges of. the bailleplates H', and in which they are secured by screws K2, as the plate H2is secured in place by the screws K. rI`he free edges of each bailleplate is spaced away from the adjacent casing wall and -baille supportto provide free communication between the intertube spaces in the banksof tubes above and below the baille plates.

The baille plates should fit snugly at their ends against the tube sheetportions of the apparatus and for this purpose the rings E and e areformed with integral transverse bars E and e', respectively, againstwhich the end edges of the baille plates bear. By forming the tube sheetportions of the apparatus in this manner it is readily possible to faceoil the inner edges of the bars E and e at the same time that the bodiesof the rings E ande are machined, as is necessary to lit them for use.This avoids Vdiiliculty which would be experienced if it were attemptedto make the baille plates tit 'snugly against the binding metal F which'cannot readily be machined, and which would be diflicult to cast withsmooth bearingsfor the edges of the baille plates...

In assembling the apparatus shown in Figs. 1 to 6 inclusive, afterthetubes and tube sheets are united in the usual manner, and the bailleplates are secured to their segmental supports I andIA, the bailleplates are moved transversely into place between the corresponding banksof tubes D. The

ltubular unit comprising the tubes, tube sheets, bale plates and bailleplate supports, are then moved endwise into the casing body A. In thusinserting the tubular element in the casing it will be understood, ofcourse, that the end of the tubular element at which the end ring E islocated, is the one first inserted in the casing body. The chamberedendmembers C and B, gasket rings F2 and spacing ring G are ordinarilysecured in place after the unitl comprising the tubes and baille plates,etc., is inserted in the casing body. It is apparent, however, that whenthe character of the gaskets permit this, the end member B, gaskets F2and spacing ring G may be secured in before the tube element isinserted, and to place -ioe disassemble and reassemble the apparatus forinspection, cleaning or repairs it is then only necessary to remove thevchambered end member C. rl`he tubular element may thus be withdrawn andreinserted without removing the chambered end member B, and withoutloosening any of the pipe connections to the casing., In theassembledapparatus, the cylindrical outer surfaces of the baule plate supports land lA fit snugly against the inner wall .of the casing and are snuglyheld in place by the springs L. y,

The described cbnstruction insures a practical avoidance of any shortcircuiting of the normal zig-zag path through the intertube space forthe fiuid entering the interior of the casing body through the inlet A.and leaving the latter through the outlet A2, notwithstanding thesubstantial dierence which may exist between the pressure in the inlet Aand the outlet A2. This dierential pressure in the case of apparatusoperating under severe conditions is quite high; for example, in someuses of apparatus in which my present invention may be employed withadvantage, this pressure dierental amounts to thirty pounds per squaremc rThe modification illustrated in Figs. 7 and 8 diders from that shownin Figs. l to 4 in thateach battle plate is engaged and supported byeach of the two opposed bame supports as is specially desirable in somecases, and particularly in apparatus of relatively large size. lln theconstruction shown in Figs. 7 and 8, the tubes and the tube sheets towhich the tubes are secured, may be identical in construction andarrangement with the form shown in Figs. l to 6. lin Figs. 7 and 8 theupper and lower baiie plates h are each rigidly connected as by screws jto inturned flanges formed at the edges of the opposed segmental bameplate supports z' and a as by screws j. rIhev openings a-B foi thescrews y' carried by the baiile plate support z are elongated to permitof a slight adjustment of the baiiie supports d and a toward and awayfrom one another.

The central bame plate 7a2 is secured in a grooved rib 2 of the supportz', by screws lc substantially as the batiie plate H2 is secured in therib lf2 by the screws K in the con# struction first described. At itsopposite edges the batiie plates h2 rest upon a supporting rib 3provided on the' inner side of the support a. Similarly the bame platesit are secured in grooved ribs 4 carried by the support a by `screws 7cand each of the baiie plates h bears at its opposite edge against acorresponding supporting rib i5 carried by the baiiie support z". Eachof the baffle plates is formed adjacent one edge with ports h4 for theiuid the intertube space and these ports are arranged to give the samezig-zag passage passing through I through the intertube space which is,had with the form of apparatus shown in Figs. l to 6.

In assembling the apparatus shown in Figs. 7 and 8 the baiiie plates hand h2 are secured to the corresponding supports by exact distance apartnecessary to it the casing into which the tubular element'is to beinserted. To disassemble ,the form of apparatus shown in Figs. 7 and 8the tubular element is first withdrawn from the casing and then thescrews passing through the slots f1.3 are withdrawn, after which thesupports e' and a are moved apart to draw the corresponding baiesout ofthe spaces between the'dierent banks of tubes.

While in accordance with the provisions of the statutes i haveillustrated and described the best forms of my invention now known tome, it will be apparent to those skilled in the art that changes may bemade in the form of my invention without departing from its spirit andthat some features of the invention may beused without a correspondinguse of other features.

Having now described my invention, what l c'laimas new and desire tosecure by Letters Patent, is:

l. In heat interchanging apparatus of the type specified, thecombination with a casing of an element bodily insertible in andremovable from the casing and comprising a plurality of tubes, tubesheets to which the opposite ends of the tubes are connected, bafflesdividing the intertube space into a lurality of passes, and an opposedpair of affle supports supporting said bamesl and engaging the innerwall of the casing when said element is inserted therein.

ioo

2. lh heat interchanging apparatus of the type specified, thecombination of a casing comprising a body portion open at one end and aremovable end member normally closing the open end of said body, of anelement bodily insertible in and removable from the casing body throughthe open end thereof when said member is removed, and comprising tubes,tube sheets to which the ends of the tubes are connected, baflesdividing the intertube space into a plurality of passes and movabletransversely to the length of the tubes into and out of place when saidelement is out of the casing, and provisions for maintaining a tightjoint between one edge of, each bailie and the adjacent Wall of thecasing body when said element is inserted in the latter.

3. Inheat intel-changing apparatus of the type specified, the combinatwnof a casing comprising a body portion open at one end and a removableend member normally closing the open end of said body, of an elementbodily insertible in and removable from the casing body through the openend thereof when said member is removed, and comprising tubes, and tubesheets to which the ends of the tubes are connected, one of said tubesheetshaving a sliding t with the interior of said casing body and theother being adapted to be secured in ixed relation with the casing bodyat the open end thereof, said element also comprising batlies dividingthe intertube space into a plurality of passes and` movable transverselyt0 the length of the tubes into and out of place When said element isout of the casing, and provisions for maintaining a tight joint betweenone edge of each baille and the adjacent Wall of the casing bodywhensaid element is inserted in the latter.

4. In heat interchanging 'apparatus of the type specified, thecombination with a plurality of tubes, of a tube sheet to which one end-of each tube is connected, said tube sheet consisting of a frame memberformed of metal and comprising an annular portion A forming the marginof the tube sheet and a transverse bar or chord portion, and a body ofmetal castoin place Within the frame member about the tube ends andcontacting with said bar or chord portion andy serving to unite thelatter to one another and to the frame member, and a bame platetraversing the intertube space and bearing at one edge 40 against saidbar or chord portion.

5. In heat interchanging apparatus of the type specified, thecombination with a plurality of tubes, of tube sheets to which theopposite ends of the tubes are connected, and a baile plate traversingthe intertube space between the tube sheets, each of the latterconsisting of a frame member formed of metal and comprising an annularportion forming the margin of the tube sheet and a transverse bar orchord portion against which the corresponding end of the baille plateabuts, and a body formed of cast metal cast in place within said framemember and about tle tube ends and contacting with said bar or chordportion and serving to unite the tube ends to one another and to thframe member. 6. In heat interchanging apparatus of th rality of tubes,of tube sheets to which the opposite ends of the tubes are connected andeach tube sheet consisting of a frame portion formed of metal andcomprising an annular type specified, the combination with a pluportion,which formsthe margin ofthe tube 6% sheet, and transverse bars or chordseach projecting at its inner edge into the inter-y tube space, each tubesheet also comprising a ortion formed of metal cast about the andfitting between corresponding bars or 7 chord portions of the two tubesheets.

HANS ZIMMERNN.

tu es and rigidly connecting the latter to one 7.0l

